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I've built and ridden a couple dozen bikes using this BB or one below (like the UN-54 and such) over the years, and i personally can't tell the difference between a really...Read complete review

I've built and ridden a couple dozen bikes using this BB or one below (like the UN-54 and such) over the years, and i personally can't tell the difference between a really high end vs. a low end square taper BB other than the weight. So many of the external/integrated BB types really blow the square taper + ST crankset combos out of the water when it comes to weight and stiffness... so when you go square taper i figure you're on a tighter budget or riding a somewhat unique BB shell or crankset. And in either case, these BB's are great. I haven't done too many thousands of miles on any single UN-73 or the like... but i've done many hundreds on most, and i don't think general users buying these Shimano BB's either reach those kinds of miles, or alternatively don't mind replacing their BB's every 3 to 5 years of real use.Them's my two bits.

VS

Most Liked Negative Review

Picture of a 68mm/shipped a 73

The picture of the product in the online catalog is of a un73 68mm. I thought I was ordering a un73 68mm. I was shipped a un73 73mm. It didn't fit. The box...Read complete review

The picture of the product in the online catalog is of a un73 68mm. I thought I was ordering a un73 68mm. I was shipped a un73 73mm. It didn't fit. The box had been opened and the bracket had been greased for installation. Someone else made the same mistake and returned the item. I didn't bother to return it.

The picture of the product in the online catalog is of a un73 68mm. I thought I was ordering a un73 68mm. I was shipped a un73 73mm. It didn't fit. The box had been opened and the bracket had been greased for installation. Someone else made the same mistake and returned the item. I didn't bother to return it.

I threw one of these in a fixed gear commuter that I built up a couple years ago. It has worked well through all the abuse I put it through, and still spins perfectly today. No complaints at all--a great component for not much money.

This bottom bracket has been powering my commuter for five years. It's a simple, tested design that seems all but impervious to the grit and dirt encountered on a daily commute.

Some reviewers have hesitated about the plastic non-driveside cup. This poses no problem if properly installed. It's not designed to be torqued like the driveside -- just enough so the bottom bracket is secure. Over torquing plastic will cause it to crack.

These 7x series BBs are nice, I believe they are still made in Japan. I'd rather use these than one of the 2x or 3x series. I think the 5x are fine -- the only difference is they don't have the hollow spindle (a few grams). But at the price Jenson has them, this is the one to get. Thanks.

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